jessica ridgeway vanished walking to school on friday. and police are investigating whether her disappearance could actually be linked to other cases. abc's clayton sandell has the latest. >> reporter: in new video obtained exclusively overnight by abc news, 10-year-old jessica ridgeway, horses around with a video camera and the family dog. >> that's the camera. >> reporter: take another look. jessica recorded this video in may. >> that's the camera. >> reporter: this morning, the state crime lab is processing jessica's backpack for dna evidence. it was found sunday with her water bottle, six miles from where she was last seen. police say it's vital evidence, the only trace of her since she vanished friday. >> the bottom line to give us ideas and evidence of who may have been in contact with it. and where we can focus a search. >> reporter: that search expanded monday. more than 100 people combing roadsides and rocky terrain. meantime, police are checking reports that three weeks ago, in a nearby town, a suspicious man was seen approachin